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That goofy ass seat and not to mention the clubmans!

Change out a few things add fenders and filters and you have a decent R whatever. Prob needs tuned also. ........and just sold

The 3 bolt retainer added for much better clutch. That 74 RD engine already has the better clutch setup. R5 and early 73 RD350's have the lessor setup. But as mentioned you can use the R5 cases.

I just went through this on an R5.

B8HS are not resistor plugs. BR8HS are resistor plugs

Others more knowledgable than I will chime in but it sounds like you need to lower the needle clip and with chambers and boot intake, your mains would probably need to be like 230.

Ended up with a 140 main clip on 3 down (may go to 2nd down) pilot left stock at 40 and 2 1/2 turns out on air screw. This thing idles at 1100 RPM, Rex's Speed Shop ignition. I set it to spec at around 1300. Pulls the front wheel with ease now. Still a bit of breaking between 1/4 and half throttle. After half she rips.

This is with the genuine Yamaha air filter and stock intake tract with the side lid on. No mods there.

Mainly posting as reference for anyone having tuning issues on these. 1975 DT400B

All Mikuni

They're stock size.

OK, removed the genuine Yamaha air filter and the thing runs good now. It doesn't like the restriction. Now trying to figure out what will make it happy with the filter in.  The Yamaha manual calls for a 40 pilot and 160 main 4th on the clip. I look on a Yamaha parts site and it shows anywhere from a 150, 170, 180 main and 40 or 50 pilot.   It's hot as hell here and sweating my ass off testing.

I guess my next move will be 150 main and see where that leaves me.

Whole kit complete, coil, cdi, NGK cap, wire the stator plate has the windings and 12v upgrade. Plug and play setup. I will check all grounds. I ground the paint off of the frame where the ground is at the coil.

When I say breaking up...like missing.

There must be something as the stator plate with the wiring was not on the bike when I got it. The flywheel was there and the Yamaha CDI.

Man I have never had so many issues with 2 strokes as I'm having lately. Usually can clean carbs and have running by the afternoon.  I guess they are just getting older and more spent.

I am still at this thing. I installed a Yamaha air filter and the carb settings (jets etc) and exhaust are stock. The only non stock thing is the REXS Speed shop Ignition. The bike starts easy and will idle fine but breaks up at revs above idle.  Is there a possibility that the RSS ignition is not advancing?

I have moved the needle clip down and tried other jetting but no luck.

I had to buy the REX because there was no stator present when I got the bike.

I was in such a hurry the other day, removing the points cam exposed it. Thanks

Spray Nine cleans well.

Yeah, I have 4 like that right now!

So has to be 1993 or older and it's 400. Still a decent avenue and you get an actual title instead of a registration certificate like VT. I always have to wait until DMV calls the State to verify if the Vermont registration would convey to Missouri title. Their catalog for out of state registered vehicles does not include cycles but I always get the title. PITA to wait for them to call the state capitol every time I go. 

I didn't see where it would screw in?

Was in kind of a hurry.

Is an M8 fully threaded bolt used for pulling the R5 rotor?

I thought I was going to use the M!0x1.25 bolt that I used on the AT1.